h1 {
    text-align: center;
    color: darkorange;
    margin-top: 30px;
}

.counter {
    text-align: center;
    margin-bottom: 5px;
}

table {
    width: 800px;
    margin: 0 auto;
    text-align: center;
}

td, th {
    border: 1px solid #bcbcbc;
    padding: 5px 10px;
}

th {
    background: #42b983;
    font-size: 1.2rem;
    font-weight: 400;
    color: #fff;
    cursor: pointer;
}

tr:nth-of-type(odd) {
    background: #fff;
}

tr:nth-of-type(even) {
    background: #eee;
}